MV design guide - Schneider Electric
MV design guide - Schneider Electric
MV design guide - Schneider Electric
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Presentation<br />
Metal-enclosed,<br />
factory-built equipment<br />
Standards<br />
Apart from special cases, MERLIN GERIN equipment is in conformity with<br />
list 2 of the series 1 table in IEC 60 071 and 60 298.<br />
Rated Rated lightning Rated Normal<br />
voltage impulse power-frequency operating<br />
withstand voltage withstand voltage voltage<br />
1.2/50 µs 50 Hz<br />
kV rms. kV peak 1 minute kV rms. kV rms.<br />
list 1 list 2<br />
7.2 40 60 20 3.3 to 6.6<br />
12 60 75 28 10 to 11<br />
17.5 75 95 38 13.8 to 15<br />
24 95 125 50 20 to 22<br />
36 145 170 70 25.8 to 36<br />
Insulation levels apply to metal-enclosed switchgear at altitudes of less<br />
than 1 000 metres, 20°C, 11 g/m 3 humidity and a pressure of 1 013 mbar.<br />
Above this, derating should be considered.<br />
Each insulation level corresponds to a distance in air which guarantees<br />
equipment withstand without a test certificate.<br />
Rated Rated impulse Distance/earth<br />
voltage kV rms. withstand voltage in air cm<br />
1.2/50 µs kV peak<br />
7.2 60 10<br />
12 75 12<br />
17.5 95 16<br />
24 125 22<br />
36 170 32<br />
IEC standardised voltages<br />
Um<br />
U<br />
0.5 Um<br />
Rated power frequency<br />
withstand voltage<br />
50 Hz 1 mm<br />
20<br />
28<br />
38<br />
50<br />
70<br />
Rated voltage<br />
7.2<br />
12<br />
17.5<br />
24<br />
36<br />
60<br />
75<br />
95<br />
125<br />
170<br />
0 1.2 µs 50 µs<br />
Rated lightning<br />
withstand voltage<br />
t<br />
Ud Ur Up<br />
<strong>Schneider</strong> <strong>Electric</strong><br />
Merlin Gerin <strong>MV</strong> <strong>design</strong> <strong>guide</strong><br />
7
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